[PATCH] drm/amdkfd: Avoid null pointer in SMI event

[PATCH] drm/amdkfd: Avoid null pointer in SMI event

[Amber Lin]

Power Management IP is initialized/enabled before KFD init. When a
thermal throttling happens before kfd_smi_init is done, calling the KFD
SMI update function causes a stack dump by referring a NULL pointer (
smi_clients list). Check if kfd_init is completed before calling the
function.

Signed-off-by: Amber Lin <Amber.Lin@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index 72c893fff61a..3cd46d7190b3 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -1297,7 +1297,7 @@ void kfd_dec_compute_active(struct kfd_dev *kfd)
 
 void kgd2kfd_smi_event_throttle(struct kfd_dev *kfd, uint32_t throttle_bitmask)
 {
-	if (kfd)
+	if (kfd && kfd->init_complete)
 		kfd_smi_event_update_thermal_throttling(kfd, throttle_bitmask);
 }
 
-- 
2.17.1

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RE: [PATCH] drm/amdkfd: Avoid null pointer in SMI event

[Joshi, Mukul]

[AMD Official Use Only - Internal Distribution Only]

Reviewed-by: Mukul Joshi <mukul.joshi@amd.com>

Regards,
Mukul

-----Original Message-----
From: Lin, Amber <Amber.Lin@amd.com> 
Sent: Tuesday, March 30, 2021 5:03 PM
To: amd-gfx@lists.freedesktop.org
Cc: Joshi, Mukul <Mukul.Joshi@amd.com>; Lin, Amber <Amber.Lin@amd.com>
Subject: [PATCH] drm/amdkfd: Avoid null pointer in SMI event

Power Management IP is initialized/enabled before KFD init. When a thermal throttling happens before kfd_smi_init is done, calling the KFD SMI update function causes a stack dump by referring a NULL pointer ( smi_clients list). Check if kfd_init is completed before calling the function.

Signed-off-by: Amber Lin <Amber.Lin@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index 72c893fff61a..3cd46d7190b3 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -1297,7 +1297,7 @@ void kfd_dec_compute_active(struct kfd_dev *kfd)
 
 void kgd2kfd_smi_event_throttle(struct kfd_dev *kfd, uint32_t throttle_bitmask)  {
-	if (kfd)
+	if (kfd && kfd->init_complete)
 		kfd_smi_event_update_thermal_throttling(kfd, throttle_bitmask);  }
 
--
2.17.1
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